EP0255166A1 - Dispositif de serrage pour serrer un disque optique sur un plateau d'entraînement et lecteur de disque comportant un tel dispositif de serrage - Google Patents

Dispositif de serrage pour serrer un disque optique sur un plateau d'entraînement et lecteur de disque comportant un tel dispositif de serrage Download PDF

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Publication number
EP0255166A1
EP0255166A1 EP87201331A EP87201331A EP0255166A1 EP 0255166 A1 EP0255166 A1 EP 0255166A1 EP 87201331 A EP87201331 A EP 87201331A EP 87201331 A EP87201331 A EP 87201331A EP 0255166 A1 EP0255166 A1 EP 0255166A1
Authority
EP
European Patent Office
Prior art keywords
clamping device
disc
turntable
holder
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87201331A
Other languages
German (de)
English (en)
Other versions
EP0255166B1 (fr
Inventor
Henri Michiel Grobben
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0255166A1 publication Critical patent/EP0255166A1/fr
Application granted granted Critical
Publication of EP0255166B1 publication Critical patent/EP0255166B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0284—Positioning or locking of single discs of discs rotating during transducing operation by clampers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/035—Positioning by moving the loading station

Definitions

  • the invention relates to a clamping device for clamping a disc, in particular an optical disc, having a centre hole onto a turntable, comprising a turntable which is rotatable an axis of rotation and which has a centring member, and a pressure element which is movably connected to a frame and which comprises a holder for a rotatable pressure member having a centring wall, the pressure ele­ment being movable between a first position in which the holder keeps the pressure member spaced from the turntable and a second position in which the pressure member coope­rates with the turntable.
  • GB 2,148,579 (PHJ 83.103; herewith incorporated by reference) describes an optical disc player employing such a clamping device.
  • the known clamping device comprises a turntable which is mounted for rotation in the frame of the disc player and a pressure element or pressure lever which is pivotally connected to said frame by a pivoting spindle.
  • the pressure lever comprises an arm portion and a pressure-member holder, the holder being connected to the arm by a spindle which extends parallel to the pivoting spindle.
  • the pressure lever is pivotable about the pivoting spindle between a first position and a second position.
  • the lever In its first position the lever occupies a position relative to the turntable in which the pressure member is situated at a sufficient distance from the turntable to allow an optical disc to be placed onto or to be moved from the turntable. In this position the pressure member is situated loosely in the holder and is freely movable therein over a specific distance in the axial and in the radial direction. In the second position the pressure lever is pivoted to position nearer the turntable in comparison with the first position, the pressure member pressing a disc placed on the turntable against the supporting surface of the turntable.
  • the turntable is provided with a centring mandril for centring the disc on the turntable.
  • the pressure member In its side facing the turn­table the pressure member has a central cavity with a centring wall.
  • Such a stable extended position which simplifies placing a disc onto or removing it from the drawer, can be obtained in a manner known per se by supporting the drawer and the pressure element which can be actuated by the drawer in a frame which is immovably secured relative to the housing of the disc player.
  • Other parts of the disc-­record player such as the optical scanning unit and hence the turntable, however, should be supported in a frame which is connected to the housing by resilient and shock-­absorbing connecting elements.
  • Such a construction there­fore requires the use of two frames which are independently movable relative to one another, the turntable being sup­ported in one of the two frames and the pressure element being supported in the other frame.
  • the known clamping devices When the known clamping devices is used in a construction comprising two frames as described above, this may give rise to problems when the pressure element is moved from its first to its second position.
  • the pressure member which occupies an arbitrary position inside the holder, may assume such an unfavourable position relative to the turntable in specific positions of the frames relative to each other, for example as a result of vibrations or shocks, that the centring wall of the pressure member is radially displaced relative to the centring mandril of the turntable, so that the pressure member cannot be centred because the centring mandril just fails to contact with the centring wall.
  • the optical disc can be pressed down correctly and, in addition, the clamping device may be damaged.
  • the clamping device in accordance with the invention is characterized in that the holder comprises at least three resilient limbs which each have a free end and a fixed end portion, which is connected to the holder, the free end portions of the resilient limbs together enclosing a central spindle of the pressure member so as to be radially deflexible.
  • the measures applied in the clamping device in accordance with the invention ensure that the pressure member, in portions in which it is not in contact with the turntable, occupies a more or less fixed central position relative to the holder of the pressure element.
  • a suitable embodiment in which the resilient limbs exert the required radial forces on the pressure member without any significant frictional forces being produced when the pressure member rotates is characterized in that in the relaxed condition the resilient limbs extend in at least substantially radial directions and form at least substantially equal angles with one another. In this respect it may also be favourable to bend the free end portions of the resilient limbs towards the spindle of the pressure member.
  • the invention also relates to a disc-record player comprising a loading mechanism for loading a disc in particular an optical disc, which player has a chassis, the loading mechanism comprising a drawer which is movable through a front opening in the housing between a slid-out and a slid-in position for bringing the disc into a playing position, the chassis being provided with guide means for moving the drawer, which player further comprises a drive unit for driving the drawer and a clamping device in accordance with the invention, the frame of the clam­ping device being connected to said chassis by resilient and clamping means so as to be movable to a limited extent.
  • the drawer is provided with means for moving the pressure element of the clamping device between its first and its second position.
  • the optical disc-record player shown in Fig. 1 comprises a housing 1 having a front wall 3 in which a front opening 5 is formed.
  • the front wall 3 further carries actuating keys 7 and programming keys 9.
  • a chassis 11, referred to hereinafter as first frame 11 is fixedly mounted and supports a drawer 13 and a pressure element 15.
  • a deck plate 17, referred to herein­after as second frame 17, is arranged in the housing to support a turntable 19 and an optical scanning unit 21, (see also Fig. 2).
  • the first frame 11 is provided with drive means 23 comprising an electric motor and gear wheels which cooperate with teeth 25 of the drawer 13 of rectilinear movement of the drawer into and out of the housing.
  • the drawer 13 comprises a transfer means 27 for supporting a Compact Disc.
  • the pressure element 15 is pivotally connected to the first frame 11 by means of two pivot pins 29. The pivot pins engage in suitable recesses 31 formed in upright wall portions 11A of the first frame 11.
  • the second frame 17 is secured to the first frame 11 by means of four resilient and damping elements 33 in such a way that vibrations to which the housing 1 and the first frame 11 are subjected are not transmitted to the second frame 17 or are at least damped.
  • This construction consequently permits the frames 11 and 17 to move relative to one another.
  • the turntable 19 is mounted for rotation about an axis of rotation 35 which extends transversely of the sliding direction of the drawer 13.
  • the turntable 19 is coupled to a drive motor, not shown, which is secured to the second frame 17, and comprises a supporting surface 19A which is concentric with the axis of rotation 35 and is situated at the periphery of the turntable.
  • the turntable comprises a percentring cone 19B and a centring cylinder 19C having a diameter which is slightly smaller then the diameter of the centre hole of the optical disc to be played.
  • the optical scanning frame is movable through an opening 17A in the second frame 17.
  • the scanning unit 21 serves for optically reading the optical disc during operation. A comprehensive description of such a scanning unit can be found in US-PS 4,403,316 (herewith incorpo­rated by reference).
  • the pressure element 15 and turntable 19 form part of an embodiment of the clamping device in accordance with the invention.
  • the flap-like pressure element 15 which is movable relative to the turntable 19 comprises a holder 37 for a round disc-shaped pressure member 39.
  • the holder 37 has a cylindrical plastics wall portion 41 with two trunnions 41A which movably engage in recesses 43 formed in the pressure element 15.
  • the holder 37 is pivotable about the trunnions 41A through a limited angle relative to the pressure element 15.
  • the pressure member 39 which serves to press an optical disc onto the turn­table 19 during operation, is situated partly inside the space in the holder 37 which is bounded by the wall portion 41.
  • Two inwardly directed ribs 45 connected to the wall portion ensure that the pressure member 39 cannot fall out the holder when the pressure member 39 is lifted off the turntable 19 by a pivotal movement of the pressure element 15 (see also Fig. 3).
  • the pressure element 15 is pivotable about said pivot pins 29 between a first position, in which the pressure member 39 is situated at an adequate distance from the turntable 19 to allow a disc to be placed on or to be removed from the turntable, and a second position, in which the pressure member 39 presses a disc against the turntable 19.
  • Fig. 1 the pressure element 15 is in its second position and in Fig. 3 it is shown in a first position.
  • Fig. 3 shows the pressure element 15 tilted through an angle of approximately 90°. In practice, the tilting angle need only be a few degrees, for example 15°.
  • the pressure member 39 On its upper side the pressure member 39 is provided with a spindle 47 having a free end 47A against which a portion 15A of the pressure element 15 is pressed in the second position of the pressure element 15.
  • the pressure member 39 On its underside the pressure member 39 has a cylindrical centring wall 49 which is constructed to cooperate with a centring edge 19B1 of the precentring cone 19B.
  • the pressure member 39 In the first position of the pressure element 15 the pressure member 39 is situated in the holder 37 with clearance both in the axial and in the radial direction, the mechanism being so dimensioned that in the second position of the pressure element 15 the pressure member is not in contact with the wall portion 41 and the ribs 45 of the holder 37.
  • a radial displacement of the pressure member 39 relative to the holder 41 and hence relative to the pressure element 15 is necessary to enable the pressure member 39 to be centered relative to the turntable 19 during the pivotal movement of the pressure element 15 from its first to its second position, the centring wall 49 sliding along the centring edge 19B1 into the cone 19B.
  • the holder 37 is provided with three plastics limbs 51 which each have a fixed end 51A which is connected to the wall portion 41 (see also Fig. 5).
  • the limbs 51 extend in a substantially radial direction and each have a bent free end portion 51B. Together the free end portions 51B enclose the spindle 47 of the pressure member 39, the limbs keeping the pressure member 39 centred in the holder 37 in positions in which it is not in contact with the cone 19B of the turntable 19.
  • the special arran­gement of the limbs 51 allows the pressure member 39 to move radially for the purpose of centring relative to the turntable during its cooperation with the cone 19B.
  • the above clamping device has the advantage that also in the case of very large displacements of the frames 11 and 17 relative to each other it can be guaranteed that the centring wall 49 of the pressure member 39 and the centring edge 19B1 of the cone 19B are in functional contact with each other to centre the pressure member 39 relative to the turntable 29 during the movement of the pressure element 25 from its first to its second position.
  • the pressure to be exerted on the pressure member 39 by the pressure element 15 in the second position of the pressure element is, for example, furnished by two tension springs 53 which are secured to the frame 11 at one of their ends and to projections 55 of the pressure element 15 at their other ends.
  • the pivotal movements from the second to the first position of the pressure element is derived from the inward movement of the drawer 13 in that two wheels 57 of the pressure element 15 run over two surfaces 59 of the drawer 13.
  • the three limbs are arranged in three slotted openings in the upper wall of the holder. It is obvious that the invention is not limited to the embodiment described but that other embodiments are possible within the scope of the invention.
  • a translatable pressure element may be utilized or the holder may be provided with four limbs.
EP87201331A 1986-07-28 1987-07-14 Dispositif de serrage pour serrer un disque optique sur un plateau d'entraînement et lecteur de disque comportant un tel dispositif de serrage Expired - Lifetime EP0255166B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8601938 1986-07-28
NL8601938A NL8601938A (nl) 1986-07-28 1986-07-28 Opspaninrichting voor het op een aandrijfspil opspannen van een optische plaat.

Publications (2)

Publication Number Publication Date
EP0255166A1 true EP0255166A1 (fr) 1988-02-03
EP0255166B1 EP0255166B1 (fr) 1992-01-02

Family

ID=19848355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201331A Expired - Lifetime EP0255166B1 (fr) 1986-07-28 1987-07-14 Dispositif de serrage pour serrer un disque optique sur un plateau d'entraînement et lecteur de disque comportant un tel dispositif de serrage

Country Status (6)

Country Link
US (1) US4799209A (fr)
EP (1) EP0255166B1 (fr)
JP (1) JP2637107B2 (fr)
KR (1) KR950003989B1 (fr)
DE (1) DE3775651D1 (fr)
NL (1) NL8601938A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024717A1 (fr) * 1994-03-09 1995-09-14 Philips Electronics N.V. Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement
US6529200B2 (en) 1998-07-31 2003-03-04 Sony United Kingdon Limited Caching in digital video processing apparatus
US6542330B1 (en) 1999-06-30 2003-04-01 Seagate Technology Llc Disc clamp for improved disc stack balance
CN110459248A (zh) * 2019-07-03 2019-11-15 黎明职业大学 一种用于计算机硬盘的减震装置

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8702604A (nl) * 1987-11-02 1989-06-01 Philips Nv Platenspeler met een laadinrichting voor het laden van een op een plaatdrager aanwezige plaat.
US5163038A (en) * 1988-07-17 1992-11-10 Nakamichi Corporation Recording and/or reproducing apparatus with vibration isolation means
US5123004A (en) * 1988-07-17 1992-06-16 501 Nakamichi Corporation Recording and/or reproducing apparatus having a vertically movable disk chassis and arranged to prevent external forces from disrupting proper operations
NL8901186A (nl) * 1989-05-11 1990-12-03 Philips Nv Platenspeler, alsmede laadinrichting ten gebruike in de platenspeler.
JP3179458B2 (ja) * 1989-07-07 2001-06-25 ソニー株式会社 光磁気ディスク装置
GB2238158B (en) * 1989-10-16 1994-02-09 Alpine Electronics Inc Disk loading device
US5181197A (en) 1990-01-31 1993-01-19 Mitsumi Electric Co., Ltd. Optical disk driver and operational processing apparatus having such optical disk driver
JPH0810522B2 (ja) * 1990-02-09 1996-01-31 パイオニア株式会社 マルチディスクプレーヤ
DE69131993T2 (de) * 1990-12-19 2000-07-20 Mobile Storage Technology Inc Miniatur-festplattenantrieb für tragbaren computer
US5133011A (en) * 1990-12-26 1992-07-21 International Business Machines Corporation Method and apparatus for linear vocal control of cursor position
US5243481A (en) * 1991-09-25 1993-09-07 Integral Peripherals, Inc. Clamp for information storage disk
US6310747B1 (en) 1991-09-25 2001-10-30 Mobile Storage Technology, Inc. Method for reducing external signal interference with signals in a computer disk storage system
US5379171A (en) * 1991-09-25 1995-01-03 Integral Peripherals Microminiature hard disk drive
US5596458A (en) * 1994-12-19 1997-01-21 Integral Peripherals, Inc. Variable zone layout for information storage disk drive
US6005725A (en) * 1994-12-19 1999-12-21 Mobile Storage Technology Inc. Variable zone layout and track pitch parameter considerations for information storage disk drive
US7342741B1 (en) 2000-02-10 2008-03-11 Esgw Holdings Limited Disk drive with variable track density
JP4597503B2 (ja) * 2003-10-20 2010-12-15 パナソニック株式会社 ディスク装置
JP2007193853A (ja) 2006-01-16 2007-08-02 Fujitsu Ten Ltd ディスク再生装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254086A1 (fr) * 1973-12-05 1975-07-04 Olivetti & Co Spa
FR2337397A1 (fr) * 1976-01-02 1977-07-29 Thomson Brandt Dispositif d'entrainement d'un videodisque a stabilisation aerodynamique
DE2927502A1 (de) * 1976-06-10 1980-02-21 Robotron Veb K Aufspannvorrichtung fuer eine flexible magnetplatte
US4409629A (en) * 1981-05-04 1983-10-11 Magnum Division Of Tandon Corporation Mechanism for centering and clamping a floppy disc
EP0128331A1 (fr) * 1983-05-09 1984-12-19 Hitachi, Ltd. Dispositif de positionnement et de verrouillage d'un disque porteur d'informations
EP0130636A1 (fr) * 1983-06-15 1985-01-09 Koninklijke Philips Electronics N.V. Lecteur de disque comportant un mécanisme de chargement pour charger un disque d'enregistrement
GB2148579A (en) * 1983-08-24 1985-05-30 Philips Nv Disc-record player
US4536867A (en) * 1984-04-16 1985-08-20 Qume Corporation Self-centering disc

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900002980B1 (en) * 1985-01-23 1990-05-03 Sanyo Electric Co Disc player

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254086A1 (fr) * 1973-12-05 1975-07-04 Olivetti & Co Spa
FR2337397A1 (fr) * 1976-01-02 1977-07-29 Thomson Brandt Dispositif d'entrainement d'un videodisque a stabilisation aerodynamique
DE2927502A1 (de) * 1976-06-10 1980-02-21 Robotron Veb K Aufspannvorrichtung fuer eine flexible magnetplatte
US4409629A (en) * 1981-05-04 1983-10-11 Magnum Division Of Tandon Corporation Mechanism for centering and clamping a floppy disc
EP0128331A1 (fr) * 1983-05-09 1984-12-19 Hitachi, Ltd. Dispositif de positionnement et de verrouillage d'un disque porteur d'informations
EP0130636A1 (fr) * 1983-06-15 1985-01-09 Koninklijke Philips Electronics N.V. Lecteur de disque comportant un mécanisme de chargement pour charger un disque d'enregistrement
GB2148579A (en) * 1983-08-24 1985-05-30 Philips Nv Disc-record player
US4536867A (en) * 1984-04-16 1985-08-20 Qume Corporation Self-centering disc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 22, no. 1, June 1979, pages 293-295, New York, US; K.D. RUSCH et al.: "Flexible disk drive having precise centering mechanism" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024717A1 (fr) * 1994-03-09 1995-09-14 Philips Electronics N.V. Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement
US6529200B2 (en) 1998-07-31 2003-03-04 Sony United Kingdon Limited Caching in digital video processing apparatus
US6542330B1 (en) 1999-06-30 2003-04-01 Seagate Technology Llc Disc clamp for improved disc stack balance
CN110459248A (zh) * 2019-07-03 2019-11-15 黎明职业大学 一种用于计算机硬盘的减震装置

Also Published As

Publication number Publication date
KR880002177A (ko) 1988-04-29
KR950003989B1 (ko) 1995-04-21
NL8601938A (nl) 1988-02-16
JPS6334764A (ja) 1988-02-15
EP0255166B1 (fr) 1992-01-02
US4799209A (en) 1989-01-17
JP2637107B2 (ja) 1997-08-06
DE3775651D1 (de) 1992-02-13

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